Soundtrack: Am I legally required to answer that question?

[caption id="attachment_1057" align="alignright" width="200" caption="Steven Bierfeldt: Flush, iPhone-carrying, libertarian security risk"][/caption] Last March,  Steven Bierfeldt, a 25-year-old libertarian who works for US Congressman Ron Paul, tried to board a plane at Lambert-St. Louis International Airport, when a security x-ray machine turned up a metal box in his carry-on baggage containing $4700 in cash, proceeds from the sale of tee-shirts and literature at a Ron Paul event the previous day. Transportation Security Administration (TSA) officials hauled Bierfeldt out of the lineup and detained him for half an hour, demanding to know the source of the (perfectly legal) money, along with a raft of...